* A gun-toting thug was arrested in connection with a violent apartment robbery in Washington Heights, authorities said yesterday.

Jorge Arias, 20, and two accomplices allegedly forced their way into a West 176th Street apartment at gunpoint at about 5:30 a.m. last May 6.

After identifying themselves as cops to the occupants, a family of three, the suspects allegedly swiped about $4,000, a Playstation game console and a cellphone.

One perpetrator pistol-whipped one of the victims, then tied him up and pummeled and kicked him, cops said. Arias was captured Tuesday and charged with burglary, robbery and criminal impersonation, a spokeswoman for the Manhattan DA’s Office said.

* A homeless woman was arrested in Midtown for threatening to slash a witness scheduled to testify against the woman’s boyfriend in a prostitution case, authorities said yesterday.

Latoya Myrie, 19, confronted the witness, a woman, at Eighth Avenue and 40th Street at around 2 p.m. on April 14, sources said.

Referring to her boyfriend, Myrie allegedly snarled, “We’re living on the street because of you. Don’t testify or you won’t see your kids. I’ll cut up your face.”

The woman, a grand-jury witness against Thomas Spann, a suspect charged with promoting prostitution in Queens, alerted cops, sources said. Myrie was tracked down Monday and charged with witness tampering.

* Police are seeking the public’s assistance in finding the woman pictured above.

Cops said Sharon Jackson, 42, was last seen on April 23 at 5:30 p.m. at Mount Sinai Hospital on Fifth Avenue near 98th Street.

Police said Jackson, who lives on Columbus Avenue, is in poor mental condition.

* Detectives are hunting the Chelsea bank robber pictured above.

The crook demanded cash from a teller at the Citibank branch at Sixth Avenue and 23rd Street shortly after 3:40 p.m. Tuesday. He received an unspecified sum and fled.

THE BRONX

* Cops found a woman stabbed to death and her roommate attempting to flee their Riverdale apartment, police said.

Responding officers smelled smoke when they arrived at the apartment on Arlington Avenue near West 259th Street shortly after 3 a.m. They forced open the door and saw Anthony Silva, 51, throwing his belongings out a window, police said.

They apprehended him, then went into the bathroom and found Silva’s roommate, Linda Jiminez, 54, whom he had stabbed in the chest, cops said.

Silva was charged with murder and manslaughter.

Brooklyn

* A dimwitted purse-snatcher was busted in Boerum Hill after he told police he was holding the pocketbook for a friend, authorities said yesterday.

The incident began at 1 p.m. last Friday when the victim, a 39-year-old woman, put her purse on a counter in a store at Schermerhorn and Bond streets.

After she left the shop, she realized she had left the purse behind and went back inside to find it was gone. She alerted cops, who spotted Brown carrying the purse nearby. Brown said he was holding the purse for a friend and pointed to the victim, saying, “That’s her right there,” sources said. He was charged with petit larceny.

Staten Island

* Three people were arrested on drug charges after police executed a search warrant at their New Brighton apartment, authorities said yesterday.

Krista Cobbs, 36, Robert Knox, 33, and Anthony Mack, 40, were in the Brighton Avenue apartment near Trumbull Place when police entered at about 5:10 a.m. Wednesday, sources said. Cops found four plastic bags of crack cocaine in the bedroom.

The three were charged with criminal possession of a controlled substance, said DA spokesman Daniel Donovan.